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- Title
Quasinormal modes as a distinguisher between general relativity and f(R) gravity: charged black-holes.
- Authors
Bhattacharyya, Soham; Shankaranarayanan, S.
- Abstract
The ring-down phase of black-hole perturbations is governed by the quasi-normal modes (QNM) and offer valuable insight into the nature of the objects emitting them, raising an interesting question: whether QNMs can be used to distinguish between theories of gravity? We construct a consistency test of general relativity (GR) which enables one to distinguish between general relativity and a specific class of modified theories of gravity: f(R). We show that an energetic inequality between scalar (polar) and vector (axial) type gravitational perturbations will exist for Reissner-Nördstrom solutions of GR - using which we find a novel method of determining the charge of a non-spinning black hole in GR. We then show that there will be a further energetic difference for charged black holes in f(R). Finally, we utilize this extra difference to construct a parameter to quantify deviation from GR.
- Subjects
RELATIVITY (Physics); RELATIVISTIC mechanics; GRAVITY; GRAVITATIONAL fields; GRAVITY waves
- Publication
European Physical Journal C -- Particles & Fields, 2018, Vol 78, Issue 9, p1
- ISSN
1434-6044
- Publication type
Article
- DOI
10.1140/epjc/s10052-018-6222-1